1970s Burlington twin sheet set with an extra large pillowcase in Vera Neumann designed red, white and blue mod arch and stripe pattern.   Fabric is 50% cotton/50% poly. 
The bottom fitted sheet elastic is very bad, has deteriorated from age and does not properly stretch.
All the pieces are faded from years of washing, but there are no holes or rips or tears and all the pieces are clean and free of stains.
The big body pillow case is 20" x 40".   It is the piece probably in best condition, looks a little less faded as the actual 3-piece set.